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Chesprocott Health District - News: What is thermal expansion in residential water supply pipes, why is it a problem, and what is the solution?
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Section: Frequently Asked Questions
What is thermal expansion in residential water supply pipes, why is it a problem, and what is the solution?
Last Update: Sep 03, 2002

Thermal expansion is caused when the supply water entering a building at ambient ground temperature is warmed in a closed residential piping system. With check valves in place at the building entrance (to avoid cross contamination) and all end service valves in a closed (locked) position, the water expands and pressure increases rapidly (again, since water does not compress). The potential result: damage to pipes and fittings. SOLUTION: Installation of at least one pressure-relieving toilet fill valve, preferably closest to the building entrance, should solve the problem. CESCO’s pressure differential ballcocks throughout the building will give added protection for the piping system.



FAQ Introduction
Common Toilet Troubleshooting Steps and some Frequently Asked Questions.
How long should it take to fill the tank and how can that be regulated?
The time to fill the tank varies with the design and size of the tank.
Why do toilet suppliers caution against over-tightening the nuts on toilet tank fixtures and trim?
Toilets are made of vitreous china, an exceptionally strong and durable material but one that can crack if subjected to a sharp impact or excessive stress.
What is the best way to adjust the water level in the tank?
The techniques vary by design among toilet fill valves.
Why must the refill tube always be kept above the water level?
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How important is it to flush the line before or when installing a replacement toilet fill valve?
0
What are the leading causes of premature failure of all toilet tank fittings and what are the implications?
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Considering Cutting the Overflow Tube Below the C-L Marking on the Fill Valve?
Some fill valve suppliers and "how to" guides recommend cutting the overflow tube at 1" below the C-L mark on the valve. When should this be done?
Conformance with anti-siphon installation requirements of the ASSE 1002 Standard
Why does the critical level (C-L) mark of a toilet fill valve have to be a minimum of 1" above the top of the overflow tube (flood plain) to be in conformance with anti-siphon installation requirements of the ASSE 1002 Standard?
What is water hammer, why is it a problem, and what can be done to eliminate it?
Water hammer is the instantaneous increase in water pressure that occurs when water flowing in a pipe stops abruptly (as with a snap action valve closing).
Why does CESCO suggest that toilet repairs should be done by licensed plumber?
Should plumber’s putty, thread sealant, grease or lubricants ever be used in the installation or repairs of toilet fill
What is the least understood and most ignored routine maintenance tasks?
Why is it important to recognize and conform to anti-siphon codes?
What is thermal expansion in residential water supply pipes, why is it a problem, and what is the solution?
Why do many leading suppliers of [plastic] fill valves disclaim responsibility/reliability from product failures?
How much water should be in the bowl after the flushing cycle is completed and the fill valve shuts off?

 

Barry E. Walter Sr. Co. 2550 East Platte Avenue - Fort Morgan, CO 80701 - 800-767-5552

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